储层条件下致密砂岩动静态弹性力学参数实验研究

doi:10.13722/j.cnki.jrme.2014.1109

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Abstract Differences existed in dynamic and static elastic parameters. In order to obtain the transformation functions between dynamic and static elastic parameters，experiments were done under reservoir conditions，which had important practical significance for fracturing in reservoirs. Rock mechanical properties of tight sandstones under reservoir conditions(including formation temperature and pressure) in Sulige gas field were obtained using the AutoLab 1500 machine made by the New England Research Company. The results demonstrated that dynamic Young?s modulus was greater than the static Young?s modulus，and there was a liner relationship between them in the same core samples under the same experimental conditions. The dynamic Poisson?s ratio was higher than the static Poisson?s ratio，but there was no obvious relationship between them. The compressional velocity and shear velocity would both increase when confining pressure increases or temperature decreases in one core sample. The dynamic Young?s modulus of one core sample would increase when confining pressure increases or temperature decreases. However，the static Young?s modulus of one core sample would increase when confining pressure increases or temperature increases. The dynamic Poisson?s ratio of one core sample would decrease but the static one would increase when confining pressure increases. The dynamic Poisson?s ratio of one core sample would decrease but the static one would decrease obviously when temperature increases. The mechanism for this phenomenon was analyzed，and the transformation functions between the dynamic and static elastic parameters under different temperature or pressure were obtained. Basic parameters were offered for rock mechanical property researches under reservoir conditions in tight sandstones in Sulige gas field，which provide foundation for the development of oil layer fracturing program.

Key words： rock mechanics elastic parameters reservoir conditions static/dynamic test

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.1109 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/Is1/3045

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